AD 80-21-53
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R22 | Airworthiness Directives; ROBINSON HELICOPTER Model R-22 Helicopters |
Unsafe Condition
Tooth failure of the spiral bevel gear in the main rotor transmission and possible loss of power to the main rotor system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main transmission gear teeth every 10 hours' time in service per SB-5. Remove transmission if spalling, cracks, or chips are found. Prohibit flight without operable MR chip detector system and perform pre-flight checks. Replace gear sets numbered 39 through 210 by January 31, 1981.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight unless already accomplished.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Robinson Helicopter Company Model R-22 Helicopters, fuselage numbers 0006 through 0060, with spiral bevel gear sets numbered 39 through 210 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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